Cell Biology. What is a cell? What is a cell?
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1 Cell Biology What is a cell? Cell = basic unit of life A cell is the smallest 'thing' that has all of the characteristics of life made of cells maintains homeostasis can reproduce uses energy grows is organized Anton van Leeuwenhoek - 1st to observe living cells in pond water, which he called animalcules (1673) What is a cell? The Discovery of Cells Robert Hooke - 1st person to see cells, he was looking at cork and called them "a great many boxes. (1665) Theodore Schwann - zoologist who observed all tissues of animals had cells (1839) Mattias Schleiden - botanist, observed all tissues of plants contained cells ( 1845) together they determined that all living things are made of cells
2 Rudolf Virchow - also reported that every living thing is made up of vital units, known as cells. He predicted that cells come from other cells. (1850) What are the 3 parts of cell theory? What invention allowed for the discovery of cells? The Cell Theory 1: every living organism is made of & develops from cells The Cell Theory Characteristics of Living Things 2: the cell is the basic unit of structure and function (it s the smallest unit that has char. of life) made of cells growth acquire/use energy reproduction respond to stimuli/homeostasis organization What are the characteristics of life?
3 there are 2 main ways to acquire energy autotrophs produce food ex. plants heterotrophs acquire food The Cell Theory 3: all cells come from reproduction of other cells reproduction - producing new organisms like themselves new organism = offspring ex. animals How many cells do organisms have? one cell = unicellular ex. Amoeba, bacteria multiple cells = multicellular ex. animals, plants undergo differentiation = cells become specialized asexual reproduction one organism copying itself in bacteria, protists, certain fungi, plants, animals 2 types of reproduction: sexual reproduction combination of hereditary info from 2 organisms or 2 parts of a single organism involves uniting of sperm (male sex cell) and egg (female sex cell) to form a zygote in multicellular organisms only What is the difference between heterotrophs and autotrophs? What is the difference between unicellular and multicellular?
4 How big are cells? Cells are always small, how small depends on the type of cell Cells can come in a variety of shapes/sizes Cell size/shape depends on its function The Size of Cells -limited by Surface Area to Volume ratio surface area volume -cells want more surface area -cells absorb food through their surface at a certain SA:V ratio, the cell won t be able to absorb enough food to survive Figure 4.3 What are the 3 main features of cells that all cells have? What is the difference between sexual and asexual reproduction?
5 Three Features of Cells 1. Plasma Membrane - serves as a barrier, regulates what enters/leaves the cell plasma membrane is the cell part responsible for maintaining homeostasis (= stable internal conditions) & responding to stimuli stimulus = any factor outside organism/cell ex. env. conditions - temp, ph, etc. other organism genetic material is passed from cell to cell during cell division = cell reproduction and from parent to offspring contains hereditary information - the instructions for life passed from one generation to the next in the form of genes = segment of DNA that codes for a specific trait plasma membrane is made of: phospholipid bilayer (double layer) proteins carbohydrates 2. Genetic Material DNA - "blueprint" that controls cell functions Chromatin = complex of proteins & DNA condenses into chromosomes before cell division 3. Cytoplasm located within plasma membrane contains water, salts, and other chemicals
6 Cytoplasm vs. Cytosol cytosol = liquid jelly cytoplasm = cytosol + organelles + cytoskeleton organelles specialized cell structures; float in cytosol cytoskeleton = protein fibers for structural support What are the 2 main types of cells? have cell wall and cell membrane, some have a capsule on the outside ribosomes make protein consist of bacteria and archaebacteria What is the difference between DNA and genes? What is the difference between chromosomes and DNA? What is the difference between chromosomes and chromatin? Prokaryotic Cells no membrane bound nucleus, chromosomes grouped together in an area called the nucleoid no membrane bound organelles smaller than eukaryotes Appendages include: fimbriae, pili, flagella pili - longer and fewer than fimbriae pili/fimbriae - function for attachment and recognition of molecules/other cells flagella - long tail-like structure for movement
7 Eukaryotic Cells have a membrane bound nucleus has membrane bound organelles in cytoplasm organelles perform specific functions much larger than prokaryotes organisms in Animalia, Plantae, Protista and Fungi kingdoms all have eukaryotic cells What is the difference between prokaryotic and eukaryotic cells? What is the difference between cytosol and cytoplasm? Endosymbiotic Theory Endosymbiotic Theory: -some organelles, called mitochondria & chloroplasts, have their own DNA & reproduce on their own -these organelles are descended from bacteria which were eaten by the cell and developed a symbiotic relationship which was mutually beneficial to both bacteria and larger eukaryotic cell -this theory helps explain the evolution of eukaryotic cells
8 Specialized Cells Bone Cells Cheek Cells Levels of Organization subatomic particle -> atom -> molecule -> cell > tissue -> organ -> organ system -> organism -> population > community -> ecosystem -> biosphere multicellular eukaryotes undergo differentiatio n Red Blood Cells tissue = group of specialized cells organ = multiple tissues in a structural unit organ system = multiple organs that work together each level performs new specialized functions definitions definitions tissue = specialized cells working to perform a function organ = multiple tissues in a structural unit to serve a common function organ system = organs that work together to perform 1 or more functions population = all the organisms of one species in an area community = all the living things in an area ecosystem = all the living & non-living things in an area biosphere = all of the life on Earth
9 In this image, identify a population, community and ecosystem. what process produced these different types of cells?
10 animation about eukaryotic and prokaryotic cells CK-12 Biology chapter 3.1 Introduction to Cells Review?s 1. What are the two main types of cells? EUKARYOTIC & PROKARYOTIC 2. Which one is larger? EUKARYOTIC 3. Which one does not have a membrane bound nucleus? PROKARYOTIC 4. What are the three main parts of the cell (that all cells have)? PLASMA MEMBRANE, CYTOPLASM, GENETIC MATERIAL 5. What are the 3 components of the cell theory? ALL ORGANISMS ARE MADE OF CELLS, CELLS ARE THE BASIC UNITS OF LIFE, ALL CELLS COME FROM OTHER CELLS Review?s 1. What are the two main types of cells? 2. Which one is larger? 3. Which one does not have a membrane bound nucleus? 4. What are the three main parts of the cell (that all cells have)? 5. What are the 3 components of the cell theory? 6. What theory explains how eukaryotes evolved? 7. What limits the size of cells? 8. Explain why this limits the size of cells. Review?s 6. What theory explains how eukaryotes evolved? ENDOSYMBIOTIC THEORY 7. What limits the size of cells? SURFACE AREA TO VOLUME RATIO 8. Explain why this limits the size of cells. - cells absorb food through their surface & volume grows faster than s.a., so at a certain point, they are unable to feed themselves
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